The Dai-bosatsu toge trilogy is based on Kaizan Nakazatos unfinished long series of novels (41 books, written from 1913 to 1941). Set in the last period of the Tokugawa Shogunate, Daibosatsu Toge tells the story of Tsuke Ryunosuke, a nihilistic swordmaster who doesn't hesitate to kill anyone, bad or good.